Final answer:
In welding symbols, the tail is used to provide essential additional information to the welder, such as specifications for the welding process or filler metal requirements, that the rest of the welding symbol does not convey.
Step-by-step explanation:
The tail in a welding symbol is used for indicating any additional information that is not conveyed by the rest of the welding symbol. This could include specifications for the welding process, the type of filler metal to be used, or any other pertinent details needed to complete the weld as per the required standards. In technical terms, the tail sort of acts like a footnote in a document; it provides essential information to the welder that can affect the strength, quality, and finish of the weld. Without the use of the tail in a welding symbol, there may be misunderstandings about how to execute the weld properly, which could potentially lead to structural failures or the need for costly rework.